The movement isn't a huge problem. I've printed on the back of my bicycle with my Ultimaker Original. Slight quality loss when I hit a bumpy road.
If you are on the sea (you could be on a lake I assume?) then the salty air however will most likely destroy it. My previous job was in road-side equipment, and anything near the sea was doomed if it wasn't sealed properly. Missing a simple O ring would spell doom for the electronics.
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gr5 2,224
Movement won't be a serious issue I don't think as you can see in this (real) video made by Joris who I know personally and swears it's real:
http://gizmodo.com/watch-what-happens-when-you-a-ship-a-3d-printer-while-i-1766124535
However salty air is just HORRIBLE on so many things. The brass parts will be okay but any iron or steel and probably much of the electronics will rust away to nothing. I would definitely save my money and get a used UMO or UM2 but if you are rich go for the UM3. Also you might need an air tight dry locker for the filament. I think pla will probably be okay in the humidity but not nylon and not pva. UM says keep pva at 50% or dryer but even 50% is probably too much for pva. And without pva the UM3 is not so useful.
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